Thermostatic alarm



Patented Jan. 16, T923.

` @aus sra-ras WALTERAESCHBACH AND HARRY a. Bossier, or sr. LOUIS, Mrssofoar.

THERMOSTATIC ALARM.

l Application led December 23, 1921. Serial No. 524,491.

To all, whom t may concern.'

Be it known that we, WALTER AEsoHAoi-Il and HARRY Ap BUssEY, citizens of the United States, and residents of the city of St. Louis 'and State of Missouri, have invented certainv new and useful Improvements in Thermostatic Alarms, of which the following is a specification containing a full, clear, and exact description, reference being had to the accompanying drawings, forming a part hereof.

Our invention relates to improvements in 're alarms and has for its primary object a lire alarm in which the use of a fusible link or connection is eliminated.

A further object is to construct a fire alarm in which the alarm is controlled by a thermostatic spring, which spring can be adjusted so that the device will operate at any desired temperature. A

A still further object is to construct a re alarm which is equipped with a bell and to which an electric -connection can be made and a second alarm bell installed at any desired distance or locaticn from the alarm itself.

In the drawings,

Fig. 1 is a face view of our device with parts broken away.

Fig. 2 a cross sectional view taken on the line 2-2 of Fig. 1.

Fig. 3 a cross sectional View taken on the line 3 3 of Fig. 2.

Fig. 4 an enlarged side elevation of the thermostatic spring and its supporting post.

In the construction of our device we employ an alarm having plates 5 and `6. These plates are spaced apart by means of posts 7, and between the plates is located a train of gears 8. These gears being placed in motlon by the spring 9 which is adapted to be wound up. The train of gears 8 mesh with a gear 10 which is mounted Ona' pivot 11. This pivot is supplied with a wing governor 12, which not only acts as a governor for the train of gears, but also serves the purpose of locking the device against movement. This is accomplished by means of a hook 13 which is formed onthe pawl 14. Adjacent the hook 14 is a pin 15 by means of which the alarmn can be stopped when it has been placed in motion. Secured to the pawl 13 and adjacent the pin 15 is a spring 16, whose tendency is to force the hook 13 awa from the governor 12-this is shown by otted lines in Fig. 3, and this releases lready access of air into the interior.

the mechanism and places the centrifugal ringing hammer-17 in rapid revolution, so that it strikes and rings the bell 18. This bell 18 is supported on the plate 5 by means of a post 19 and thumb nut 20. Projecting through the plate 5 is a supporting post or stud 21. This supporting post is secured to the plate 5 by means of the nut 22, and mounted on the post 21 is a thermostatic spring 23, its end 24 designed to come in Contact with the edge 25 of the pawl 14. IVhen' the thermostatic spring hasits end 24 contacting with the edge 25 of the pawl, the pawl is held in the position indicated by solid lines in Fig. 3, and on becoming heated, the spring 23 will expand. This will cause its end; 24 to assume the position shown by the dotted lines in Fig. 3, and release the pawl so that it can assume the position shown by dotted lines. This releases the train of gears in motion, and the alarm is sounded. By loosening the nut 22 and turning the supporting postc2l and thermostatic spring`V 23, the device can be adljusted so as to release the ringing mecha- 4nism at any predetermined temperature.

The train of gears and thermostatic spring are covered by a cylindrical casing 26 which is provided with perforations so as to allow This cylindrical casing or housing 26'eXtends beyond the plate 6, so that when the device is hung on a wall, the winding stem 27 will be held out of conta-ct with the wall. This housing or casing is secured to the y'plate 6 by means of screws 28 passing through ears 29 which are formed integral with the casing 26. Secured to the casing 26 are binding posts 30 and 31. The binding post 30 having secured in it an electric conductor 32 which leads to any suitable source of energy, while the binding post 31 has the conductor 33 which leads to an electric bell, the circuit being completed to the source of energy in any well known manner. rThis completion of the circuit being well known will not be described in detail, nor illustrated. The binding post 31 is insulated from the casing 26 and has a projecting end 34 with which the pawl. 14 is adapted to contact when released from the wing governor 12. In this way the circuit will be completed as it 1s grounded through the mechanism of the alarm. The plate 6 is provided with cutaway portions 35, which will allow the portions of the binding posts 30 and 31, which project on the inside of the casing to pass therethrough, so' that the device can beassembled. The alarm is also provided with a ring or similar hanger 36, so that the device can be suspended from a'hook on the wall or from the ceiling.

The operation of our device '1s as follows: The spring 9 is wound -upby means of a key which fits on the winding stem 27. The pawl 14 being held in the position indicated' by solid lines in Fig. 3', by means of the pin 15 which projects through the plate 6, after the spring 9 has been wound. This not only engages the hook 13 with the governor 12, but also allows the end 24 of the thermo'- y static spring 23 to contact with the edge 25 of the pawl 14, and hold itin the position indicated by solid lines in Fig. 3, and thus prevent the alarm from operating. Then if' the temperature arises above a predetermined degree of heat, the expansion of the thermostatic spring 23 will .force its end 24 outward as indicated by dotted lines in Fig.

, 3, releasing the pawl and allowing the train plete 'the circuit and ring this alarm. This is essential Where the device is used in dwell-.

of gears to be placed in motion by the spring 9.' This will rotate the centrifugal hammer 17 and ring the alarm. Then if the auxiliary electric alarm has been connected up, the contacting of the pawl i4 with the project ing end 34 of the binding post 31 will coming houses or in factories, so that an alarm can be rung at the danger point, and also at a central station simultaneously, and in dwelling houses where the furnace is in the cellar and the bed rooms far removedl therefrom, so that the ringing of the alarm in the cellar could not beheard by the sleepers, but by having an 'alarm in the bed room,

there will'be no possibility of the alarm goin olf without being heard.

aving fully described our invention, what we claim is:

l. A fire alarm comprising a pair of plates, a spring actuated train of vgears by said train of gears'when the wing gov` i ernor is released'.

2. A fire alarm comprising a pair of y plates, a spring actuated train of gears mounted between said plates, a wing governor carried by said train of gears, a spring actuated pawl adapted to contact with the governor and hold the .train of gears against movement, a stud secured to one of said pla-tes, a convolute thermostatic spring secured to said stud, said spring adapted to\ normally contact with the pawl for holding it in engagement with said wing governor, a bell carried by one of said plates, a centrifugal hammer adapted to rotateby said train gears when the Wing governor is released, and means for adjustably securing said stud to the plate for adjusting the release of the pawl to various temperatures. l

In testimony whereof, we'have signed our .names to this specification.

WALTER. AEscHBA-CH.' HARRY aisUssEY` 

